Yes I know you don't call yourself, but on the other hand, yours is the only number you're likely to be giving out to people. It's the only one I've memorised and for that exact purpose!
I always use that excuse when they ask for a work number or cell number. No, I don't know it, because I don't call myself. I also don't know it, because I don't want anyone to call me there. Seriously, I think only four people/entities have those numbers. 95% of the time, I don't answer my home number, either. Don't call me.